Properties of Composite Electrochemical Coatings Based on Edm Lead Bronze Charge

Purpose of research. Study of the composition, structure and properties of composite electrochemical coatings based on electroerosive lead bronze.

Methods. To obtain the charge, an installation for grinding metal waste was used, scrap lead bronze of the BrS30 brand was used as metal waste, distilled water GOST 6709-72 acted as the working medium for dispersion. In accordance with the experimental technology, samples were obtained at the L1 DIGIT installation by adding a universal copper sulphate electrolyte to a suspension of the obtained electroerosive particles, having previously prepared the samples.

Metallographic studies (microstructure, porosity) were carried out using the OLYMPUS GX51 optical inverted microscope equipped with the SIMAGIS Photolab automated image analysis system.

The wear resistance of sintered samples and coatings was determined on a high-temperature tribometer manufactured by CSM Instruments.

The hardness tests of the samples on the surface and the transverse section were carried out using the DM-8 automatic microhardness analysis system using the micro-Vickers method.

Results. In the course of studies of the properties of the coatings obtained, it was found that the addition of a suspension of lead bronze particles to a copper sulphate electrolyte at a concentration of 0.05 g / l leads to an increase in the hardness of the coatings by 12%. The study of the microstructure of the transverse section of the samples showed that coatings were obtained without visible defects at the "coating/substrate" boundary. It is established that there is an increase in the wear resistance of the composite electrolytic coating. The presence of lead inclusions acting as a lubricant helps to reduce the coefficient of friction by 10%.

Conclusion. Based on the presented research results, it can be concluded that due to the hardening of metal vapors in the working fluid during dispersion, electroerosive particles of lead bronze contribute to an increase in the wear resistance of coatings, the presence of lead inclusions leads to a decrease in the coefficient of friction, which allows us to recommend the developed technology for the restoration and hardening of sliding bearings operating under boundary friction conditions.

1. Osintsev O. E., Fedorov V. N. Med' i mednye splavy. Otechestvennye i zarubezhnye marki [Copper and copper alloys]. 2th ed., reprint. and additional. Moscow, Innovatsionnoe mashinostroenie Publ., 2016. 359 p.

2. Petrichenko V. K. Antifriktsionnye materialy i podshipniki skol'zheniya [Antifriction materials and sliding bearings]. Moscow, Mashgiz Publ., 1954. 383 p.

3. Shestopalova L. P. Konstruktsionnye i zashchitno-otdelochnye materialy transportnykh sredstv [Structural and protective and finishing materials of vehicles]. Moscow, MADI Publ., 2019. 216 p.

4. Ageev E. V., Semenikhin B. A., Ageeva E. V., Latypov R. A. Issledovanie khimicheskogo sostava poroshkov, poluchennykh elektroerozionnym dispergirovaniem tverdogo splava [Investigation of the chemical composition of powders obtained by electroerosive dispersion of a hard alloy]. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta = Proceedings of the Southwest State University, 2011, no. 5 (38), pt. 1, pp. 138a–144.

5. Ageeva E. V., Latypov R. A., Burak P. I., Ageev E. V. Poluchenie tverdosplavnykh izdelii kholodnym izostaticheskim pressovaniem elektroerozionnykh poroshkov i ikh issledovanie [Obtaining hard-alloy products by cold isostatic pressing of electroerosive powders and their research]. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta = Proceedings of the Southwest State University, 2013, no. 5 (50), pp. 116–125.

6. Ageev E. V., Latypova G. R., Davydov A. A., Ageeva E. V. Provedenie rentgenospektral'nogo mikroanaliza tverdosplavnykh elektroerozionnykh poroshkov [Conducting X-ray spectral microanalysis of carbide electroerosion powders]. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta = Proceedings of the Southwest State University, 2012, no. 5 (44), pt. 2, pp. 99–102.

7. Ageev E. V., Gadalov V. N., Ageeva E. V., Bobryshev R. V. Poroshki, poluchennye elektroerozionnym dispergirovaniem otkhodov tverdykh splavov – perspektivnyi material dlya vosstanovleniya detalei avtotraktornoi tekhniki [Powders obtained by electroerosive dispersion of solid alloy waste - a promising material for the restoration of parts of automotive equipment]. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta = Proceedings of the Southwest State University, 2012, no. 1 (40), pt. 1, pp. 182–189.

8. Shidlovsky A. K., eds. Povyshenie kachestvennykh pokazatelei i elektroerozionnogo dispergirovaniya metallov s uchetom vzaimnogo vliyaniya kharakteristik istochnika pitaniya i tekhnologicheskogo apparata [Improving the quality indicators and electroerosive dispersion of metals, taking into account the mutual influence of the characteristics of the power source and the technological apparatus]. Sovershenstvovanie elektrooborudovaniya i sredstv avtomatizatsii tekhnologicheskikh protsessov promyshlennykh predpriyatii [Improvement of electrical equipment and automation of technological processes of industrial enterprises]. Komsomolsk-on-Amur, KnAPI Publ., 1986, pp. 98–99.

9. Bayramov P. K. Poluchenie vysokodispersnykh poroshkov metallov i ikh soedinenii elektroiskrovym dispergirovaniem metallov [Obtaining highly dispersed powders of metals and their compounds by electric spark dispersion of metals]. Moscow, MISIS Publ., 2012. 80 p.

10. Ageev E. V. Ustanovka dlya polucheniya nanodispersnykh poroshkov iz tokoprovodyashchikh materialov [Installation for the production of nanodisperse powders from conductive materials]. Patent RF, no. 2449859, 2012.

11. Ageev E. V., Semenikhin B. A., Latypov R. A. Issledovanie mikrotverdosti poroshkov, poluchennykh elektroerozionnym dispergirovaniem tverdogo splava [Investigation of microhardness of powders obtained by electroerosive dispersion of a hard alloy]. Vestnik Federal'nogo gosudarstvennogo obrazovatel'nogo uchrezhdeniya vysshego professional'nogo obrazovaniya "Moskovskii gosudarstvennyi agroinzhenernyi universitet imeni V. P. Goryachkina" = Bulletin of the Federal State Educational Institution of Higher Professional Education "Moscow State Agroengineering University named after V. P. Goryachkin", 2011, no. 1 (46), pp. 78–80.

12. Latypov R. A., Latypova G. R., Ageev E. V., Davydov A. A. Razrabotka i issledovanie tverdosplavnykh izdelii iz poroshkov, poluchennykh elektroerozionnym dispergirovaniem vol'framsoderzhashchikh otkhodov [Development and research of carbide products from powders obtained by electroerosive dispersion of tungsten-containing waste]. Mezhdunarodnyi nauchnyi zhurnal = International Scientific Journal, 2013, no. 2, pp. 107–112.

13. Latypov R. A., Korostelev A. B., Ageev E. V., Semenikhin B. A. Svoistva poroshkov iz otkhodov tverdykh splavov VK8 i T15K6, poluchennykh metodom elektroerozionnogo dispergirovaniya [Properties of powders from waste of hard alloys VK8 and T15K6 obtained by the method of electroerosive dispersion]. Vse materialy. Entsiklopedicheskii spravochnik = All materials. Encyclopedic reference, 2010, no. 7, pp. 2–6.

14. Latypov R. A., Latypova G. R., Ageev E. V., Altukhov A. Y., Ageeva E. V. Properties of the coatings fabricated by plasma-jet hard-facing by dispersed mechanical engineering wastes. Russian metallurgy (Metally), 2018, vol. 2018, no. 6, pp. 573–575.

15. Ageev E. V., Gadalov V. N., Serebrovsky V. I., Semenikhin B. A., Ageeva E. V., Latypov R. A., Gnezdilova Yu. P. Issledovanie granulometricheskogo sostava poroshkov, poluchennykh eletroerozionnym dispergirovaniem tverdogo splava i ispol'zuemykh pri vosstanovlenii i uprochnenii detalei avtotraktornoi tekhniki [Investigation of the granulometric composition of powders obtained by electroerosive dispersion of a hard alloy and used in the restoration and hardening of parts of automotive equipment]. Vestnik Kurskoi gosudarstvennoi sel'skokhozyaistvennoi akademii = Bulletin of the Kursk State Agricultural Academy, 2010, no. 4, pp. 76–79.

16. Latypov R. A., Ageev E. V., Davydov A. A. Vosstanovlenie i uprochnenie detalei mashin i instrumenta s ispol'zovaniem poroshkov, poluchennykh elektroerozionnym dispergirovaniem vol'framsoderzhashchikh otkhodov [Restoration and hardening of machine parts and tools using powders obtained by electroerosive dispersion of tungsten-containing waste]. Remont. Vosstanovlenie. Modernizatsiya = Repair. Recovery. Modernization, 2013, no. 12, pp. 23–28.

17. Novikov E. P., Ageeva E. V., Chumak-Zhun D. A. Izuchenie formy i morfologii poroshka, poluchennogo iz otkhodov alyuminiya metodom elektroerozionnogo dispergirovaniya [Study of the shape and morphology of the powder obtained from aluminum waste by the method of electroerosive dispersion]. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta. Seriya: Tekhnika i tekhnologii = Proceedings of the Southwest State University. Series: Engineering and Technologies, 2015, no. 4 (17), pp. 13–17.

18. Ageeva E. V., Ageev E. V., Karpenko V. Yu. Izuchenie formy i elementnogo sostava poroshka, poluchennogo iz vol'framsoderzhashchikh otkhodov instrumental'nykh materialov elektroerozionnym dispergirovaniem v vodnoi srede [Study of the form and elemental composition of powder obtained from tungsten-containing waste of tool materials by electroerosive dispersion in an aqueous medium]. Uprochnyayushchie tekhnologii i pokrytiya = Hardening technologies and coatings, 2014, no. 4 (112), pp. 14–17.

19. Latypov R. A., Ageev E. V., Ageeva E. V., Novikov E. P. Issledovanie alyuminievogo poroshka, poluchennogo metodom elektroerozionnogo dispergirovaniya v distillirovannoi vode [Investigation of aluminum powder obtained by the method of electroerosive dispersion in distilled water]. Vse materialy. Entsiklopedicheskii spravochnik = All materials. Encyclopedic reference, 2016, no. 4,. pp. 19–22.

20. Ageeva E. V., Ageev E. V., Pikalov S. V., Vorobiev E. A., Novikov A. N. X-ray analysis of the powder of micro- and nanometer fractions, obtained from wastes of alloy T15K6 in aqueous medium. Journal of Nano- and Electronic Physics, 2015, vol. 7, no. 4, p. 04058.

21. Ageeva E. V., Horyakova N. M., Ageev E. V. Issledovanie formy i morfologii elektroerozionnykh mednykh poroshkov, poluchennykh iz otkhodov [Investigation of the form and morphology of electroerosive copper powders obtained from waste]. Vestnik mashinostroeniya = Bulletin of Mechanical Engineering, 2014, no. 8, pp. 73–75.